Transformer for electric metal-working apparatus.



L. S. LACHMAN. TRANSFORMER FOB ELECTRIC METAL WORKING APPARATUS. 1 1.111.1110! rzmm mum, 1909.

. y L i 3 1 ITNESSES: INVENTO D' 2 w LaUI'em lculnnqn.

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.ATTORNE n5? UNITED STATES PATEN T OFFICE.

LAURENCE S. LAOHMAN, OF NEW YORK, N. Y., ASSIGNOR TO UNIVERSAL ELECTRIC WELDING COMPANY, OF NEW YORK, N. 'Y., A CORPORATION 035 NEW YORK.

TRANSFORMER FOR ELECTRIC METAL-WORKING APPARATUS.

Specification of Letters Patent.

Patented Jan. 17, 1911.

To all whom it may concern:

Be it known that I, LAI'RENCF. S. LACIP aux. a citizen of the United States, and a resident of New York, in the county of New York and State of New York. have invented certain new and useful Improvements in 'lransformers for Electric Metal-\Vorking Apparatus. of which the following is a specification.

My, invention relates to improvements in transformers and more particularly to improvements in the secondary of that class of transformersused in electric metal working apparatus.

The main object of the invention is to avoid sliding contacts between the secondary ot' the transformer and the work-holders and to make the \YOl'k-IIOltlt-I'S practically integral with the secondary and at the same time permit them to be moved to and away from each other.

A further object is to avoid the necessity of flexible connections between the workhohilers and the secondary and thus reduce the number of parts and make the apparatu more etiicient.

To these ends the invention consists in the improved form of transformer secondary hereinafter more 'uufticularly described and then specified in the claims.

in the accompanying drawings, Figure 1 illustrates, in side elevation. the preferred form of secondary constructed in accordance with myiuvention. Fig. 2 illustrates an edge view of the same. Fig. 3 is a plan view, the work-holders being removed. Fig. i. a side elevation of the secondary, showing the parts thereof as having been moved with relation to each other. Fig. 5 illustrates an edge view of a modification.

The secondary is ln'et'erably .t'ormcd of copper and is cast or otherwise suitably constructed. "h secz'mdarv in the preferred form consists of two similar parts or structures. 1, 1', suitably formed in turns and provided with the usual gap 3 between the terminals thereof 4-, indicate the primary coils located eitl'icr side of the secondary, the core of the usual construction and location not being shown.

()ne terminal of the part 2 of the secondary is preferably provided with a laterally proiecting lug (3 while the oppo ite terminal of the part 1 is provided vwith a similar lug T projecting in the opposite direction.

The two parts 1 and 2 are ireeto move longitudinally with relation to each other in the space between the primary coils i and 5, any amount of desired movement being obtainable and preferably electrical connectained.

The terminal blocks or work-holder bases, indicated at Sand 9 are rigidly secured to the secondary, one to each of the parts 1 and 2 thereof, by means of the lugs t) and 7 and suitable fastening bolts 20 and may both be movable to and away from each other, owing to the capability of movement of the parts tired and the other movable to and away from the fixed one 9. The work-holders or clamps secured to the bases 8 and 9 and the mechanism for moving them form no part of this invention and are not shown.

The parts 1 and 2 preferably slide on each other and are held in close contact by any suitable means such as a bolt 10 secured to one part and working in a slot ll in the other part. If desired, a suitable insulating bushing 12 might be employed around the shank of tho-bolt 10 where it: passes through and works in the slot 11 to prevent sparking when the apparatus is in operation.

My invention is not limited to any specific manner of mounting the work-holder bases or terminal blocks on the secondary as any suitable way of securing these parts might be employed without departing from the spirit of the invention.

It will also be understood that the invention is not limited to any particular form of secondary nor to the arrangement of the parts with relation to each other as shown a nualilication being illustrated in Fig. (5 in which the two parts of the secomlary do not slide in contact with each other, but are electrically united by means of flexible bars or cables .1 the main operation being the same as in the preferred form.

.lVhat I claim as my invention is:

1. A transformer secondary consisting of two rigid turns in parallel planes and adapted to move'longitmlinally with relation to each other.

A transformer secondary consisting of two rigid parts lying in parallel planes and tion between the parts land 2 being main-- of the secondary or one, such as 9, may beadapted to move longitudinally with relation to each other and each provided with a work-support on one terminal thereof. 7

3. A transformer secondary consisting of two rigid turns lying in parallel planes and adapted to move with relation toeach other 'in said planes to cause the terminals thereof to move to and away from one another.

' 4. A transformer secondary consisting of two rigid turns lying in different planes and adapted to move with relation to each other to cause the terminals thereof to move to or away from one another and means for keeping said turns in electrical connection with 6. A transformer secondary consisting-of two structures adapted to slide longitudinally with relation to and in side contact with, each other and carrying a work-support at a terminal of each structure and means adapted to keep said structures in close contact during said sliding. 7 A transformer seconda consisting of two structures lying in para lel planes and adapted to move longitudinally withrelation to each other and each provided with a work-support on opposite terminals thereof. Signed at New York, in the county of New York and State of New York this {3th day of February, A. D. 1909. I

LAURENCE s. LAC-HMAN.

Witnesses:

EDWARD M. JELLINEK, IRENE LEFKOWITZ. 

